NTSTATUS 0xC01C001A (STATUS_FLT_VOLUME_ALREADY

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Description:

the specified volume was already mounted when Filter Manager received the mount-related request

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STATUS_FLT_NO_DEVICE_OBJECT	STATUS_FLT_ALREADY_ENLISTED

STATUS_FLT_VOLUME_ALREADY_MOUNTED

STATUS_FLT_VOLUME_ALREADY_MOUNTED reports a mount lifecycle state. The specified volume is already mounted, so a caller must not interpret the result as proof that a particular minifilter instance is attached, active, or configured as expected.

Separate volume mount from filter attachment. A mounted volume can still be excluded by an instance setup callback, can have an instance at a different altitude, or can be in a teardown transition. Diagnose the current instance stack rather than attempting to mount the volume again.

What to compare

Mount state of the volume versus the minifilter's instance state.
Automatic attachment policy and any recorded STATUS_FLT_DO_NOT_ATTACH result.
The timing of mount notifications, manual attach requests, and dismount activity.

Filter Manager concepts | InstanceSetupCallback | NTSTATUS reference

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